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A radio antenna emits EM waves at a frequency of 100 MHz and an intensity of 0.2 W/m². What is the photon density in one cubic meter of the beam?
- 1.0E12 photons/cubic meter - 1.0E16 photons/cubic meter - 1.0E20 photons/cubic meter - 1.4E31 photons/cubic meter - 6.1E32 photons/cubic meter
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